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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d18f396880336ffb23e4acaed082e4dbc72d0126ba5445f1fbbbcea96e359f4' 
  AND token = '/q7cHfe34h66+tU+f64yC5+QEd/gf45qI5K3j1azRrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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