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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffec3e1dd9bfa033214df512db800c1169d0a5f6d9a33091812eb6fc583a3cd' 
  AND token = 'aAygBVhQNAptEXvt1iRd8CCLUCePLveuqlCAiqLVIZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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