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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a958073d2d53396d8c8319752caa6771360e2733e0bff319323964ecb9f559' 
  AND token = 'qcjO0vGyEBHm3Ty/56ONTx/1fa2bHUq39/Ve7mWlVtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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