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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d5d25ff4cfaa1dc7b212219392015f98b063529f27569cb55e97b41fbc3977' 
  AND token = 'WH/FMAlHh6SJjlQ+1TJrgMlXICQSgPcXt8ZnTWkVC2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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