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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98d227d6522b0350ae4edaabbbc6676bda6445dcb8cab144ac3d190e12d5e17' 
  AND token = '+Ih0crGDQCPWYUN1Lwkha2HKdSxKn1XcM+uO9+mBeJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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