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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f86a4ee4ccdd8f936131fd9069fdaf31f4cf8a5294cd28ebac0381f2280dcbf' 
  AND token = 'VO86nwUj0GX5FBUfhpbEmBVQEtr9CVmceEOVxglHYiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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