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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae6c8f364954ddaad6a7f45bac8a446465fb2962a75e36b4bb1460cbf192062' 
  AND token = '+tUhwsf8I8nCnNmGNBXxsaLrDVwMHJV1aIhp4PpuvQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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