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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17dac39c0993df879c6ccc697d5451adce4e400f8417d35d28e7cf9964d32ea4' 
  AND token = '6gNGpE9RXoeh8pANCROh6m1HC6m3x5WBqJTSzf2S4t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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