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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f711a2ef6fb79db8fbc49678e891dfd4a99006f999a7c5519945641b074e4f22' 
  AND token = '4MWu2hvjhYfPTmz8MOgyTjLSeAbMCe797URlVMh6PZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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