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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8d17aa321fb4ca0b66232378c7b13c4a1cf01316a49532d46d4bb29320fda3' 
  AND token = 'eSdu0/mZIfQHLdVeKGds46O35cRlf6wI/1Si2bRavig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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