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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6d72d928cfd3a1ad6cca6faf3755a22d3d6dc4c5ccfebc8d0535bf30e5cd91' 
  AND token = 'cEhcx5Po1gKaVNP6Bc0uWLGgKpTS9bmY3+0gtD3tUrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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