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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c1e19d89a5c5e38176d387ed0955d07af00e1ab57fa8da74cc6ed982c2d038' 
  AND token = 'bxA8bfkbR37WwQ4sp44fZ7IWUdBgCdieLPLHGeHQtzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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