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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004cef7aa6e050e90380e6ab66c2cf0173c88c39dc9c5e851cef4b29531bf379' 
  AND token = 'rV14lktSIBdtgA0Bo/mtQ7PKQvFLEIcmuTKxZz4hwh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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