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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '158b4aefed080def9cb0a0db2efcd0273f4e0708e32571e39070b7649e48d4f8' 
  AND token = 'iMmcV3c3OhDKG0ENESmRGwFQwkJj3qdYzrAqj0djE28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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