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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc4e886c6c7eecc1c138b2f065ba2dad29ff330168a0662333ca0982b417d8f' 
  AND token = 'GLL8EgK4DWIKbrWOilC/RmdykkR/rrHI7a37yeA7s2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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