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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808bddf4e6ba96d4af629bda0f330cfd973501de6d0f3808d5ba7593e10338b6' 
  AND token = '1tpcE693JALTKAVy7nBB4w9eMDW2WMZoInKZlc7G1Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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