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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be40874d2e8740bcab20d53ff6fceccfefbd2bdda0ef6ab0953c166f2f05471' 
  AND token = 'F6zblBw5MyxtXTQVzTb8ffyMTfmInrvuicgTZY5Bcnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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