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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff316e19e076fbb3f3c8d3554cc5456d139f5319697f28a19ded18762375a03' 
  AND token = '0Vas1KErVyCLo80zhvYpQaP0ryStnC+pFjG0Qt5J5JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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