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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b39965d02b0a4f93d46fe8ca0674272457b7f212a1ba92fbc95fdaf9348c96' 
  AND token = 'Wn1/3weXFkOh89Bsec9AwFXkMjyOaCXkuA+TyTz0+zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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