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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae241f4446cb08046629fa19bed3aac5c6914e2832b0e5eff0e249b1e4cc12be' 
  AND token = 'VARvmy/nLKUpToSGYy32ApnI7IRcbwEVn7lmLF87o9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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