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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fec3d8b1ef7cfb88bc4152d8ea43edae01511e33256f6f5e5c6391790166d3' 
  AND token = 'XU7vzHUAXX0x+tqM/qtgEQ+hLvyeoPn1HfRkMlIORu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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