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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f001315a4797db24cf7d5da5e95d7419888bb1dc0063fb6d5b82abe9dca8e5' 
  AND token = 'X4/AoUbRQQbmFlk4FS0yl11bC0j+9wuaz++AaRpuRog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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