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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c44ee1d07744725fefa6c16af7ab5bc3766c77493cfee6ded41e5505c61f6c' 
  AND token = 'qxSolLcC+0bdYJAY5SbScDX/NBbU57ruI2YOWMCoDhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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