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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f48801e4611a58f3c8293552ab49e3759f426bbb5dcd0560c3650ed20f1af8f' 
  AND token = 'gLMjQRCHu8EsEH9wJRg1yuZAQUU9T1r8M3ZSWzoui/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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