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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933f57068d82b4961a3a48286df6bb73402d2fbc0ce45caf437259b4c8dc864b' 
  AND token = 'L+YqbRI2NjB/VowdffWEankRz5H7nUDa1tIEtPhYksc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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