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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a612c5afa65040243f8058ba1be36caf49cb9ba2a4d646da9210c326e00c47d' 
  AND token = '5UJki5IK4yvxC4wBnkJZCVMyROmBFe/zBAUhaQKj4TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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