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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df0b5e9a1cd0b3e25b52330de3462a678585c5e6c9c2342bfbc0c3d103c3720' 
  AND token = 'mgh/hoHQK9sOTlvN8BJzngb8ihTfcO7nay3OiRKmV/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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