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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5f08b7f3c054f954799252a82ad27521871c7d5654b3cacb45f2c583d76300' 
  AND token = 'g6N0c99mERsvCb5hb/EbfPw187KL0PmmjPc5NF1QXb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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