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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b424fe91eca04d63be4b5dd99a819d7958f1e88d86ae3ed98656b69e6e155004' 
  AND token = 'jXiJJZAqpOrEIDgVx2m0D6CTAIkGETf19xO6DXk3F58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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