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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456e37975aad563fd4e0ff491dda9f1d62680d4de6d0321a5bb051db1186f5ea' 
  AND token = 'AVGUDWYCpcNxmcwQuU019C69TZc2r2JGdf1hPGGew/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00255

JSON explain

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