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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea43336583b1d74f1c0bd5680eacbf62638949c63d43c87bd50fa9693f304db' 
  AND token = 'w7dQ4KvLJg0Jpu/VgdEYemooga/Hyn+pLC1hEDk2cmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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