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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71acefcf2b4e11a3d81b32b03c987c5d3a5fd99ee7664974fe43b2db9fee916a' 
  AND token = 'f3TZNzC/0ljv8xiqt8hxJK9xC10hNfLIabK6Sz+5uq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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