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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8346c5ceceec362a8438b8e18c155d89ee916b1a86e915f5abe30d130acf493' 
  AND token = 'aSr4HGuV94KS1BfP7jQ0Hc0tgDHiX79havZvnK6Nzgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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