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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b4e73de4b65312052e7e0b71f47dd11bfed97f8773209215f4cd804c05b194' 
  AND token = 'O40sKS4ClCSodN9BF09KhoJI7EraCWBBfLD5Y9mDDao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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