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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9b006326f2d5bb373acb30cba63da434ce4d0ccef7ea059c3551aec4fdcfa3' 
  AND token = 'i7jMw+FyVvIl34ciWXEMoH0e1Yls9r7UbyCsMB/whGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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