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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d56298bb5db4696cdf5d5c5c6f4c8d318913c0dd3d633555ebd1b88bb616f7' 
  AND token = 'WnNqlbCztm4SsdAXkdUexS4dgch3qPfnRKLdOpNPnWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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