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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2a0e43d66420ca70ed5c302036783477a7b4cac0a06294f7e80c0bb144442a' 
  AND token = 'VAb3qiqnKkMm0TKGuJgh6ppPevKQIFMv63tJdzIpeaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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