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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceafa540c6a30f2d2f673cae74b0d2fe1b3b02ca7b7ff31f9963f68134b4f986' 
  AND token = 'HePbhu4zzLWQ/H9g1io0jJ82Q7X3prPJ10VOaVODhiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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