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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7d6561a057cfea269b3778116f4589f7abf41d75b7fc61837dd6e1eaec90e4' 
  AND token = 'imL4WBW8AeXOfPMxbPVzu6rd3lHe0bWw9pz/S7Ao9cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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