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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559a93bb59cda26e3bf502ce398327531e4503eb47e822547c8349dfea0f01fd' 
  AND token = '8W4lbeZj1J5rliEmyAOvpJpOEogjuF1YD3o/XkEFEIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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