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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e32d33541d3ae94e9e0085db5db3c6c04f9562f3f5082de2f55f8db7fcb9a0' 
  AND token = '95uAzZtYEkBJZPOX+sl026wzPc8ch/jv6iNKiXUysbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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