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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a40b670d2daa0be67e0b0e9a224489d9b22846b92d14448617273ddff200a5' 
  AND token = 'MJKrUnfNIVOFq4oo6qVIkIaQaXs4LSrBP+1ZPoBvp/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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