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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f973c9e536ba11198d49becebe83a63e03b7a8563bdf7b2b0f0fbab54e612a' 
  AND token = 'VjmVr9EnlcIPUt70oV+Tlq/Lx3/Bp1Kp40D4whscz08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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