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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8a547495f197a7e1dd8df2a716c81313e0e370fb194ef10e514a0f2bc1e59e' 
  AND token = 'XPzFU9zVy/+Xt7GhtcWgjWjXEYFWUjQVlvytWNYoBhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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