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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bfd9c5572c38cdfa1340374e9ef01ba222865cdd27df74b2deb5a07b43f5df' 
  AND token = '2By1C3dapG9jYwp3JMtkn3NgOR3cW1fmG/RD9OF7d48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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