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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede3b6f9ccf76c9f112f4dcc296630da3a1fac43a25a830e66c3149fd986427d' 
  AND token = 'hcjppbEHV+absBxfv7+MIuTFXdZTzF4cEvUeoEG1LkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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