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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f94eb21c8c3b7cf30427def4b2c5013c99697868cf4eeb917e05119c61572e' 
  AND token = 'TweMxssJKamyeyb6zxrnYlufLEUDb1EG6CgRM80OEn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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