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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2076e83754a7a3e691920eaccab79cb66782e0588d58b0b505b3102f360256' 
  AND token = 'PzTsKNlU+N/dDos/O/7P1arz2b3zV5x4UDuxGXydRiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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