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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90760f80dbd5c2c1f7b888d87c3b848073af159011d3233327e2e2e61a994b73' 
  AND token = 'JsSYCz8PFI/1pISjH7g3Ey+zdW+kqXHQl4yIkVY1efs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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