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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a288f069a5b61c88f3bd2c267db3c203f68c4e66077f339d7dcda532cf77b1' 
  AND token = 'mpHZuyvHbmdqMaprn4Gtrwzd8po57upE3p2J0r7T0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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