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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0700e5e6f035c303c1641245eade3fdf74edfc6ec6fc27d542d1ba3f8173f69' 
  AND token = 'lXMFK7Usoz/pKN83DTteJo7zPL4X1fz3J4BYk5GuUHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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