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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '587a1675b192f4316b24430eecef90951ed5c37c3301cbd206acaf1837266ace' 
  AND token = 'uM27dmzW/RElyuoVrglvSc1nnfkSBKMRraEMmnWb87Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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