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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39795de6a2bc193e7da5a590d6ad801d3cd1feb6f6a350044c446e50dae6b0ff' 
  AND token = 'JDd6sForgwADsHc/DFsHZn/5ICtUtD8J8tRXHkVI4YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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