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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d63f915c99708943e9e8d55f7398a02f348a896af8051d8bba3b74a26d30f9' 
  AND token = 'OvAWBd7Ptzr6oT1ibM0h1dNhifz70SdetB6zizEyekA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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