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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbb37fa2698c272dee9b163368a84f35db59ef4004d821bd3417198da9de83d' 
  AND token = 'N4LprZqQxZ3SArqaGbsBqOBg3en3p+OKfVfeNUV4Fgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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