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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a562d615fdbcae5154739e92e53edf3e919370a8fb22f20765c8a2c147f86c6e' 
  AND token = 'LN/jkenyY+eB+FF+dIcplTUvTv/EAhjfjjUptQ5XfPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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