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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623b706e7f5e46c23893727539197b5b15591d413988eea1b0b916b13f061d51' 
  AND token = 'H1Y0CcBh2KtkwMqkxpJCIdbqj14txf9j6f2h4XspyIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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