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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b294d6a0a4df0a0ff3db14d66a68d78066532f537148fbf7fc34f94f6429a820' 
  AND token = '6jF4hspdjFTtQVsmt0x9e4y1AnoZx6J/PIf8EGFBxAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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