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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd979e94a670de0eb122aa069f5ad753843918fcfc758e0e8d1fa6ff74f2b27e7' 
  AND token = 'CndFaJ80r/RZSOhRv0bA2tSZ72AiK1I9oOWya+jnI6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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