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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7ea731911ae618a28a23045cb08b86a739c9bfe00197a0ed642b3a213e8130' 
  AND token = 'gNvSszlpUt6IOiCn1jQJtwHE6yNnER1iBclTu3b4dhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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