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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f5bc2ce9dcfbd59717bcd81801a8a84db7769d872b387d8fa8cdbbdad8662c' 
  AND token = 'CpP4aI/MP2bMVLVZkV6lywuGRT4KGSlowcJp/Cqx+II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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