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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c967afe48373cf738dcf4ad8034232e61f321c547ec9785aebd3858c4e0a92e' 
  AND token = 'lv5LtNmEyF4/vY7PA4nGHl4nyAcX/PC6fb38GRbZv1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}