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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83a644fedffba424a35715e8d8ab561a45f1a10bd9559613e37458a1dab36fa' 
  AND token = '4MpaoTI7ODHkNu4ZxumS1i+gv9WhJ/l45b74Wdsb1wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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