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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ac89c4969d25c0bab8509aed4cba600e56018565212e10c5d49d3b702369ea' 
  AND token = 'ekpDYArP4lLJQuKZpHxzXwd3Z8nL7PjAxceZdzHsF/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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